implicit_call_tearoffs

Explicitly tear-off call methods when using an object as a Function.

DO Explicitly tear off .call methods from objects when assigning to a Function type. There is less magic with an explicit tear off. Future language versions may remove the implicit call tear off.

BAD:

class Callable {
  void call() {}
}
void callIt(void Function() f) {
  f();
}

callIt(Callable());

GOOD:

class Callable {
  void call() {}
}
void callIt(void Function() f) {
  f();
}

callIt(Callable().call);

To enable the implicit_call_tearoffs rule, add implicit_call_tearoffs under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - implicit_call_tearoffs

If you're instead using the YAML map syntax to configure linter rules, add implicit_call_tearoffs: true under linter > rules:

linter:
  rules:
    implicit_call_tearoffs: true

Unless stated otherwise, the documentation on this site reflects Dart 3.6.0. Page last updated on 2025-01-27. View source or report an issue.